✓AI Data Cleaning
LOCAL BY DEFAULT · OPTIONAL TEMPORARY WORKSPACE

Clean, standardise and deduplicate your CSV.

Profile your data, choose cleanup rules, review each change and download a new CSV. Your original stays intact.

1. Choose a CSV to clean

Your file opens directly in the local app. Contents stay in this browser; no account needed.

Up to 20 MiB, 100,000 rows and 500 columns.

  1. Choose CSV
  2. Profile and choose cleanup rules
  3. Review and download a new CSV
01

Profile

See filled, empty, unique and repeated values for every column before you change anything.

02

Build a plan

Add precise cleanup rules in a visible order. Undo the latest step or reset the plan at any time.

03

Review and export

Compare the preview, inspect fuzzy-match suggestions, and download a new CSV only when you are ready.

Optional: preview in temporary Loam

Preview a CSV before uploading. Upload starts only after you confirm Upload to temporary Loam in the app.

Up to 5 GiB; selection does not upload it.

  1. Choose CSV
  2. Confirm upload and preview rules
  3. Compare a limited preview

Temporary mode uploads a copy after confirmation. It shows a limited preview and cannot save a cleaned result.

Choose the right way to clean your data

Local mode: clean, profile, standardise, deduplicate, review and export a complete CSV in this browser. File contents are not uploaded.

Temporary Loam: explicitly upload to a private dataset that expires. Preview lowercase, uppercase and exact-deduplication plans within the stated query limits.

Governed Loam: connect the dedicated Data Cleaning MCP resource to profile, preview, compare, and create source-preserving cleaned views under your workspace permissions.

DATA CLEANING GUIDES

Solve a specific data quality problem

Transparent AI data cleaningAutomate rules while keeping ambiguous decisions human.CSV data cleanerClean a CSV locally without uploading it.Record deduplicationRemove exact duplicates and review possible matches.Data profilingMeasure missing, unique and repeated values.Data qualityCheck quality before and after each step.Data wranglingTurn messy values into a repeatable plan.HubSpot exportsPrepare exported CRM records for review.Salesforce exportsClean exported accounts and contacts carefully.Google Sheets duplicatesReview duplicates through a CSV workflow.Data cleaning with ClaudeReview the dedicated, closed Data Cleaning MCP surface.

Frequently asked questions

Is my CSV uploaded when I clean it locally?

No. Local cleaning processes the CSV in this browser without an account. Temporary Loam mode is a separate option and uploads a copy only after you confirm it in the application.

Which files can I clean?

Local mode accepts one CSV up to 20 MiB, 100,000 rows and 500 columns. Export other formats as CSV first. Download your cleaned result before refreshing or closing the tab.

Does cleaning overwrite my original CSV?

No. Rules change a preview that you can undo or reset. Export downloads a separate cleaned CSV and processes the complete accepted file.

Data Cleanerby Loamstack